Motor skill is one of the most basic intelligent activities
by human beings. We can acquire various high level physical skills such
as throwing, typewriting, playing musical instruments and so on. However,
it is difficult to understand the mechanism of the skill by experts. Here,
we discuss motor skill in terms of dynamic constraint satisfaction including
motion integrity constraint (MIC). Some biomedical experiments show that
some constraints for joint angle coordination and combinations of activated
muscles are satisfied by experts. If we know the skill achievement mechanism
by experts, it can be quite useful to improve amateurs' skills. In addition,
it can also be helpful to prevent injuries coming up from bad muscles usages.